Update CI

.github/workflows/tests.yml

@@ -0,0 +1,50 @@
+name: CI Tests
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+  push:
+    branches:
+      - master
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    name: Lint on node 12.x and ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Use Node.js 12.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+
+      - name: Install deps and build
+        run: yarn install
+
+      - name: Lint codebase
+        run: yarn lint
+
+  test:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        node: ['10.x', '12.x', '13.x']
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+
+    name: Test on node ${{ matrix.node }} and ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Use Node.js ${{ matrix.node }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: Install deps and build
+        run: yarn install
+
+      - name: Test package
+        run: yarn test --runInBand